Lubricating apparatus

ABSTRACT

In an air flow responsive injection lubricator the air flow responder, a lubricant reservoir, and a pump are stacked vertically, the reservoir also serving as an accumulator which prevents air bubbles from reaching the injector. Nesting of the responder and reservoir reduces size to about that of a conventional airline lubricator. The reservoir and an interior lubricant delivery duct are transparent for observation of a shiny cylindrical material bobber in the duct.

United States Patent Thrasher Dec. 16, 1975 LUBRICATING APPARATUS 3,628,631 12/1971 OLeary 184/55 A 3,731,763 5/1973 Thrasher, Jr. et a1. 184/7 D [75] Inventor- Gem'ge Pomlac, 3,841,438 /1974 Tine et al 184/7 D [73] Assignee: Master Pneumatic-Detroit, Inc.,

Sterling Height Mi h, Primary Examiner-Richard C. Pinkham Assistant ExaminerArnold W. Kramer [22] Filed 1974 Attorney, Agent, or Firm-Barnes, Kisselle, Raisch & [211 App]. No.: 502,203 C Oate 52 11.5. c1. 184/29; 184/56 A; 184/7 D; [57] F FE 184/1 C In an an flow responsive in ection lubricator the air [51] Int. Cl. F16N 13/16 flow responder, a lubricant reservoir, and a P p are [58] Fi ld f Search 134/55 A, R, 7 D, 7 E stacked vertically, the reservoir also serving as an ac- 184/1 C, 4 2 27 B 52 53 96, 97 9 cumulator which prevents air bubbles from reaching 5 7 F, 32 34 3 39 42 the injector. Nesting of the responder and reservoir reduces size to about that of a conventional airline lu- [56] References Cited bricator. The reservoir and an interior lubricant deliv- UNITED STATES PATENTS ery duct are transparent for observation of a shiny cylindrical material bobber in the duct.

2,532,441 12/1950 Cox 184/55 A 2,792,911 5/1957 Hatter 184 7 E 30 Claims, 9 Drawing Figures W A? 2/0 24 Z 2/0 '42 Z09 1 2/3 7 w 2/2 3 2 16 7 /7 Z4 4 I 7 W g 1 E- I i 7 Z f T y if -II I Z I 7 2 02% 7 1 1 w ZZJ Z24 4 146 f 2/6 4 9 /6Z /0 00 0/1 6 2 4J l 40 g //02 /46 J? {Z US. Patent Dec. 16, 1975 Sheet 1 of3 3,926,279

US. Patent Dec. 16, 1975 Sheet 3 of3 LIJBRICATING APPARATUS This invention relates to lubricators of the type dis closed in US. Pat. No. 3,731,763 issued May 8, 1973.

In such a lubricator lubricant is furnished to a pneumat- I ically operated tool, or the like, by means of an injection type pump. A sensing device or responder is mounted in the airline through which compressed air is furnished to the tool..

This device responds to each starting and stopping of a flow of air in the airline and causes the pump injector to advance when the air flow starts, to remain in its advance position for so long as the air flow continues, and

is that their overall size has been substantially larger than that of a conventional airline accessory, which has precluded their use in numerous installations A second is that when the lubricator is furnished with lubricant from a remote reservoir through a supply tube, air bubbles in the supply tube tend to become trapped in the injector; and when this happens, the injector ceases to function. Thirdly, the lubricator has been somewhat more costly to manufacture than is desirable.

The object of the present invention is to provide a lubricator structure of the type discussed above which is improved with respect to compactness, lower cost of manufacture, simplicity, freedom from malfunction because of trapped air bubbles, and is further improved in that it can be determined upon visual observation whether the structure is operating satisfactorily. One

form of the invention is shown in the accompanying drawings:

FIG. 1 is a view of a pneumatic system which incorporates a lubricator according to the present invention.

FIG. 2 is a top plan view of the lubricator.

FIG. 3 is a sectional view on line 33 of FIG. 2.

FIG. 4 is an enlarged scale sectional view on line 44 of FIG. 2.

FIG. 5 is a fragmentary sectional view on line 5-5 of FIG. 4.

FIG. 6 is an enlarged scale view partly in elevation and partly in section of a bobber.

FIG. 7 is a sectional view on line 7-7 of FIG. 4.

FIG. 8 is a sectional view on line 88 of FIG. 4.

FIG. 9 is a fragmentary view similar to FIG. 4 but showing movable parts in a different position.

Shown in FIG. 1 is a pneumatic system 10 which incorporates a lubricator 12 according to the present invention. The system includes an airline 14 through which compressed air is furnished to pneumatically powered equipment 16 which for the sake of simplicity is illustrated as a hand heldtool. Upstream of lubricator l2, airline 14 is provided with a conventional pressure regulator 18 and a conventional filter 20. Downstream of lubricator l2 airline 14 continues in a flexible hose 22 through which is threaded a small diameter lubricant delivery tube 24.

Lubricator 12 comprisesin vertically. stacked relation an air flow sensing device or responder 26', a lubricant reservoir 28 and an injection type lubricant pump 30. Reservoir 28 has a base 32 and an inverted generally cup shaped member 34 having a closed upper end, a generally vertical side wall 36 and an open lower end defined by a generally annular edge 38. Edge 38 and base 32 are clamped against opposite faces ofa seal gasket 40.

The upper end of member 34 has spaced apart top portions 42, 44 and intermediatev portion 46 spaced therebelow to define a generally central vertical recess 48 within which sensing device 26 is disposed. Top portion 42 has a vent opening 49 therein normally closed by a plug 50 having an O-ring seal 52. Plug 50 is manually removable in an upward direction to expose a vent hole 54 therein above the top portion 42. Top portion 44 of the reservoir has a fill opening 56 illustrated as being closed by a threaded, remq able plug 58.

A pair of hollow struts 60 project downwardly from the closed end of reservoir member 34 in alignment with apertured bosses 62 on base 32. Bosses 62 and the lower ends 64 of struts 60 are clamped against opposite faces of gasket 40. Pump 30 has a body 66 with a bottom 68 engaged by a clamping yoke 70. This yoke has apertured ears 72 aligned with bosses 62. Responder 26 has a body 74 with a pair of threaded openings 76 aligned with struts 60. Gasket 40 has a pair of openings 78 also aligned with the struts. A pair of tie bolts 80 pass through ears 72, bosses 62, openings 78, struts 60 and are threaded into openings 76 to clamp responder 26, reservoir 28, and pump 30 in assembled relation.

A seal gasket 82 is clamped between upper portion 46 of reservoir member 34 and a bottom surface 84 of responder body 74. A seal gasket 86 is clamped between a top portion 90 of pump body 66 and a bottom surface 88 of reservoir base 32.

Depending from upper portion 46 of reservoir member 34 is a tube 92 having an interior 94 which forms part of a passageway for compressed air from responder 26 to an air inlet opening 96 in pump body 66. Reservoir base 32 has a boss 98 with an opening 100 aligned between tube interior 94 and inlet 96. Boss 98 and the lower end 102 of tube 92 are clamped against opposite faces of gasket 40 around an opening 104 Air inlet 96 communicates into a pneumatic cylinder.

108 within pump body 66. A piston l 10 in the cylinder has a piston rod 1 12 which projects slidably through an opening 114 in a disc 116 in the cylinder, through an O-ring seal 118, and through an opening 120 in a wall portion 122 of pump body 66. A coil spring 124 around piston rod 112 is compressed against disc 116 and urges piston 110 to the left as FIG. 4 is viewed. Piston rod 112 has a free end portion 126 which projects into a lubricant inlet passageway 128 formed in pump body 66. End portion 126 forms a pump plunger or injector as is brought out in greater detail below.

The upper end of inlet 128 is aligned with a lubricant delivery port 130 in reservoir bottom 32 and an opening 132 in gasket 86. A filter 134 of wire screen, or the equivalent, is mounted within the reservoir and filters lubricant passing from the reservoir interior through delivery port 130 into passageway 128.

Pump body 66 is formed with a lubricant outlet passageway having a portion 136 which opens into inlet l28.and is aligned with plunger 126. The outlet passageway continues in a portion 138 which contains a check valve 140 and downstream thereof an outlet port 142 with which is aligned an opening 144 in gasket 86,

an opening 146 through a boss 147 on base 32 and an opening 148 in gasket 40. Check valve 140 includes a plug 150 surrounded by a compressed coil spring 152 which urges a head 154 on the plug to the left as FIG. 4 is viewed. Plug 150 carries a seal element 156 which closes the downstream end of outlet portion 136 in deactuated condition of pump 30.

Depending from upper portion 46 of reservoir member 34 is a tube 158 having interior 160 aligned with gasket opening 148 and forming a portion of a duct through which lubricant is delivered from lubricator 12. Boss 147 and the lower end 162 of tube 158 are clamped against opposite faces of gasket 40.

Tube interior 160 is shaped to provide a shoulder 164 upon which a bobber 166 seats in deactuated condition of pump 30. For reasons described below, this bobber is preferably cylindrical in shape and is preferably made of a shiny material such as aluminum. The bobber has a density greater than the lubricant passing through duct 160, and its mass may be diminished by boring out a portion thereof as represented at 168 (FIG. 6).

The lubricant delivery duct continues upwardly from tube 158 in an opening 170 in reservoir top portion 46, an opening 172 in gasket 82, and a passageway 174 in responder body 74. Passageway 174 has a lateral continuation 176 into which is fitted an exit tube 178 to which delivery tube 24 is connected. Opening 170 is shown as being provided with a filter screen 180.

Body 74 of responder 26 has a compressed air inlet nipple 182 threaded for attachment to an upstream portion 184 of airline 14 and has a compressed air outlet nipple 186 threaded for attachment to a downstream portion 188 of airline 14. Body 74 defines a compressed air passageway 190 between inlet 182 and outlet 186. Body 74 has interior portions which define an annular wall 192 forming a chamber 194 which communicates with inlet 182.

A sensing disc 196 fits axially slidably within an opening 198 formed by an interior portion of wall 192. Body 74 also has a hollow boss 200 having an upper end portion 202 which defines a valve seat. Disc 196 carries a central seal 204 which forms a valve member engaged with valve seat 202 in deactuated condition of lubricator 12. Disc 196 has an upward lug 206 surrounded by a coil spring 208 compressed between disc 196 and an upper cover plate 209 on body 74. Spring 208 urges seal 204 into engagement with valve seat 202. Body 74 has a plurality of internal bosses 210, four being shown, which form guides for guiding movement of disc 196 upwardly beyond opening 198.

I-Iollow boss 200 defines a passageway having an upper portion 212 which extends downwardly from valve seat 202 and an enlarged lower portion 214 which opens through the bottom of body 74 in alignment with an opening 216 in gasket 82 in turn aligned with the upper end of passageway 94 within the tube 92. Disc 196 has a stem 218 which depends into passageway portion 212. Radial clearance 220 is provided between the stern and passageway.

Stem 218 has a radial shoulder 222 and continues downwardly in a smaller diameter portion 224 upon which is slidably mounted a poppet valve disc 226. Ra-

dial clearance 227 is provided between disc 226 and passageway portion 214. A compressed coil spring 228 maintains disc 226 in engagement with shoulder 222. At the juncture between passageway portions 212 and 214 are a plurality of bosses, 230, three being shown,

4 one of which has an opening 232 which communicates into a vent passageway 234.

Reservoir member 34 has a transparent side wall portion 36, and for this purpose the entire member may be made from atransparent material-such as glass or a plastic such as polycarbonate. Advantageously the member, including side wall 36, struts 60, and tubes 92, 158, may comprise a single integral injection molded unit. Side wall 36 has a portion 236 which is thickened and rounded to form a lens. This lens is in general proximity to tube 158 and bobber 166 contained therein.

Pump 30 includes an external knob 238, which can be manually turned to adjust the axial location of plunger 126 in its retracted position so that the depth of penetration of the plunger into pump outlet 136 can be adjusted. Pump 30 also incorporates an external rod or button 240 which can be pushed manually inwardly or to the right as FIG. 4 is viewed to manually operate the pump plunger.

In use, to fill reservoir 28, vent plug 50 is pulled upwardly until O-ring 52 and vent hole 54 clear upper portion 42 of the reservoir. Fill plug 58 is threaded out of opening 56 in upper portion 44 of the reservoir. Lubricant is then poured into the reservoir, for example to the level L represented in FIG. 3. Plugs 50 and 58 are then replaced in their respective openings. If the reservoir is to be continually replenished from a remote source, this can be done by providing a lubricant supply line which opens through plug 58 in a known manner.

The system is primed by any suitable conventional procedure as by prefilling delivery tube 24 and by successively actuating plunger 126 until the system between inlet 128 exit tube 178 is filled.

When equipment 16 is set into operation, compressed air flows thereto through airline 14 including upstream and downstream portions 184, 186 thereof connected to lubricator 12. The air flows through chamber 194 and forces disc 196 upwardly against the action of spring 208 (FIG. 9). This lifts seal 204 off of valve seat 202 and a portion of the air begins to flow through the branch passageway comprised of clearance 220 around stem 218 and through clearance 227 around poppet disc 226. At the same time, shoulder 222 on stem 218 elevates and poppet disc 226 follows movement of the shoulder under the action of spring The upper surface of the poppet disc engages bosses 230 and at least partially closes vent port 232. There-' upon pressure immediately builds beneath the poppet disc forcing it more tightly against lugs 230 and more thoroughly sealing vent port 232. This increase in pressure is immediately transmitted into pump cylinder 108 through a continuation of the branch passageway comprised of opening 216 in gasket 82, tube interior 94, opening 104 in gasket 40, opening in base 32, opening 106 in gasket 86, and air inlet port 96 in pump body 66.

Piston is moved to the right as FIG. 4 is viewed advancing plunger 126 to the dotted line position of FIG. 4 wherein it has penetrated into outlet passageway 136. The plunger displaces from outlet 136 a quantity of lubricant determined by the diameter of the plunger and outlet, and the depth of penetration of the plunger into the outlet. The displaced lubricant unseats check valve seal 156 and enters passageway portion 138. Lubricant is advanced in the entire delivery system from termined quantity of lubric'ant is delivered to equipment 16. i

Sensing disc 196 remains in its upward position (FIG. 9) under the influence of the flow of air through airline 14 for so long as equipment l6 continues to operate.

When the equipment is deactuated, the air flow ceases branch passageway exhausts to atmosphere through vent passageway 234. Thereupon spring-124 returns piston 110 to the leftas FIG. 4 is viewed withdrawing plunger 126 from outlet 136, and the cycle is complete.

Since stem portion 224 passes slidably through 'poppet 226, sensing disc 196 can elevate through various ranges of movement depending on the volume of air flow through passageway 190 after poppet 226 has engaged bosses 232. Upward movement of the sensing disc is limited by engagement of the top lug 206 thereon against cover 209, as shown in FIG. 9.

Lugs 230 are disposed symmetrically about the axis of poppet 226 and prevent'tilting thereof in its upward position. The interengaging surfaces ofthe lugs and poppet are machined, and these surfaces are relied upon for a seal around vent port 232 in actuated condition of the lubricator. This seal is not perfect, but any leakage therethrough is insignificant. Spring 228 .insures that poppet 226 will follow movements of=shoulder 222 should the lubricator be mounted in a non-vertical orientation.

There is almost always a certain amount of air leakage in the pneumatic systemdownstream of lubricator 12 and in equipment 16. It is desirable that such leakage be prevented from actuating the lubricator. For this purpose, a bypass is provided which permits a flow of air at a low rate through passageway 190 without influencing disc 196. Advantageously this is done simply by providing a radial clearance (not illustrated),between opening 198 and the outer periphery of the disc. Typically the magnitude of this clearance and the strength of spring 208 are coordinated to permit a flow of air from about 4CFM to about SCFM without moving disc,

In prior lubricators of the injection type, particularly those furnished from a remote reservoir through a lubricant supply line, it was possible for air bubbles entering the pump to become trapped in a part of the injection system such as passageway 136. Thereafter, upon successive movements of the pump plunger the bubbles simply compressed and expanded, which diminished or eliminated entirely delivery of lubricant to the intended equipment. i

In lubricator 12, any air bubbles contained in either the initial supply of lubricant or arriving in reservoir 28 through a lubricant supply line float to the top of the reservoir and become accumulated there. It is virtually impossible for any such bubbles to migrate downwardly to the bottom of the reservoir or through lubricant determinated, the bobber settles back down onto the shoulder. This movement is visible through transparent side wall 36 of the 'reservoir'an'd throughtransparent tube '158. The bobber is preferably cylindrical since that shape appears to provide the highest visibility. Also", for'lhigh visibility the bobber is made of a shiny or highlyreflected'material. The mass of the bobber will depend upon -such'factors as the viscosity of thelubri cant and the volume of lubricant moved upon each impulse. Starting with a bobber of a standard size, its'mass can be reduced if desired by boring out a portion 168 thereof through one end leaving the visible side walls intact.

The curvature of the body of lubricant within reser voir 28 magnifies to ,a certain extent the visual image of bobber 166. Lens shaped portion 236 of reservoir side wall 36 further magnifies visual images of the bobber. Even in relatively dim light and at distances, for example, of about 15 feet from the lubricator and several feet above or below it, movements of the bobber can be clearly discerned so that, it can be determined quickly and conveniently upon visual observation whether lubricator 12 is functioning properly.

Recess 48 in the top of reservoir 28 is deep enough so that responder 26 is almost entirely vertically contained therein. The overall vertical and horizontal dimensions of lubricator 12 are within the size limitations usually considered acceptable .for airline accessory equipment. This is particularly advantageous, for example, in, installations where the accessories are suspended from an overhead trolley and there is only an inch or so of space between thetops of the accessories and the trolley. I I

Reservoir 28 can be used optionally as an independent manually filled unit or as a unit continually replenished from a remote source. Lubr-icators 12 according to the invention, are considerably less expensive to manufacture than conventional lubricators of the inj ection type with a resulting savings to the ultimate user.

1-. In a lubricator having a pump with an inlet and an outlet and being operable upon actuation to deliver a tion in response to stopping of the air flow, said passageway having a branch through which pump actuatlivery port into inlet 128 in the pump. Thus, malfunctioning of pump 30 because of trappedair bubbles' is minimized or eliminated entirely.

Upon each cycle of operation, the upward impulse'of lubricant in outlet conduit forces bobber 166 upwardly off of shoulder 164; and when the impulse has ing air is valved in response to each movement of said element-to said one position, improved structure which comprises, i i

a" lubricant reservoir having a top, a bottom, and a hollow interior for'containing lubricant, said body being mounted on said top and said pum being mounted on said bottom, i said bottom having a lubricant delivery" port which communicates with said pump inlet, said branch including a portion which 1 extends through the bottom of said body,and means forming a continuation" of said b ranch'having portions which extendthrough the'top, hollow interior, and bottom of said reservoir, i

said continuationbeing effectiveto conduct pump actuating air to said pump. a

2. The'structur edefined in claim 1 wherein said delivery port is aligned in substantially vertical registry with'said pump inlet.

3. The structure defined in claim 1 wherein said reservoir has meansforming a tube which defines'said portion of said continuation which extends through said interior thereof. I a

4. The structure defined in claim 3 wherein said portions of said continuation extend substantially verti-' cally, 7

said delivery port being aligned in substantially vertical registry with said pump inlet.

5. The stru'cturede fined in claim 1 wherein said portions of said continuation extend substantially vertically. v 6. The structure defined in claim 1 wherein said reservoir has means defining'a lubricant delivery duct which'communicates with said pump outlet, and passes upwardly through the interior and top of said reservoir.

7. The structure defined in claim 6 wherein said body has means forming a continuation of said duct.

8. The structure defined in claim 7 wherein said duct extends through said reservoir bottom, interior, and top and through thebottom of said body.

9. The structure defined in claim 8 wherein said duct is substantially vertical.

10. The structure defined in claim 6 wherein said ductextends substantially vertically upwardly from said pumpoutlet and is formed of a transparent material,

a bobber in said duct movable upwardly under impulses of lubricant flow in said duct upon successive actuations of said pump and being gravity returned downwardly between said impulses,

said reservoir havinga transparent side wall portion through which-said bobber is visible.

11. The structure defined in claim 10 wherein said duct has a shoulder above said reservoir bottom on which said bobber rests in downward position thereof.

12. The structure defined in claim 11 wherein said shoulder is about halfway between said topand bottom of-said reservoir.- v

13. The structure defined in claim 12 wherein saidbobber comprises a substantially cylindrical body of shiny metal, said side wall portion of said reservoir being formed as a lens to enlarge the visual image of said bobber.

14. The structure defined in claim 10 wherein said bobber comprises-a substantially cylindrical body of shinymaterial.

15. The structure, defined in claim 14 wherein said cylindrical body is partially hollowed out from one end to reduce the mass thereof.

16. The structure defined in claim 10 wherein said side wall portion of said reservoir is formed as a lens to enlarge the visual image of said bobber.

17. The structure defined in claim 1 wherein said reservoir top has a vertical recess within which said body is disposed, the major part of the vertical extent of said body being received in said recess.

18. The structure defined in claim 17 wherein said recess is generally centrally located and portions of said reservoir flank, opposite sides of said body.

19. The structure defined in claim 18 wherein portions oflsaidtop of saidreservoir at opposite sides of said body are provided respectively with a fill opening and a vent opening.

20. The structure defined in claim 1 wherein said reservoir comprises a base forming said bottom and an inverted cup shaped member having an open lower end defined by edges, lower seal means between said edges and said base,

said member having a closed upper end which forms said reservoir top, upper seal means between portions of said top and said body,

said upper and lower seal means being provided with generally aligned openings,

a tube having upper and lower ends engaged respectively with said upper and lower seal means around said openings, said openings and tube defining said portions of said continuation of said branch.

21. The structure defined in claim 20 wherein said pump has a housing, top portions of which are secured to said reservoir bottom, third seal means between said top portions and reservoir bottom,

said base, third seal means and housing having openings aligned to form a portion of said continuation of said branch.

22. The structure defined in claim 21 wherein said third seals means has a second opening, said delivery port and pump inlet being aligned on opposite sides of said second opening.

23. The structure defined in claim 22 wherein said upper, lower, and third seal means and said base have other openings therein generally aligned with said pump outlet,

another tube having upper and lower ends engaged respectively with said upper and lower seal means around said other openings therein,

said other tube and openings defining a lubricant delivery duct.

24. 'The structure defined in claim 23 wherein said body has a passageway therein forming a continuation of said duct.

25. The structure defined in claim 24 wherein said pump'housing, base, reservoir member body, and seal means are secured in assembled relation by common bolt'means.

26. The structure defined in claim 25 wherein a yoke is disposed beneath said pump housing, said bolt means comprising a pair of bolts passing through said yoke,

straddling said pump housing, passing upwardlythrough said reservoir and being threaded into said body. I 27. The structure defined in claim 23 wherein said reservoir member and said tubes are formed of a single integral body of transparent material.

28. The structure defined in claim 27 wherein said other tube has an interior shoulder about half-way between said reservoir top and bottom upon which a substantially cylindrical bobber of shiny metal rests in non actuated condition of said pump, said bobber being movable upwardly in response to successive actuations of said pump.

29. The structure defined in claim 28 wherein said reservoir member has a side wall portion shaped as a lens aligned with said duct to enlarge visual images of said bobber.

30. The structure defined in claim 23 wherein said reservoir top-has a generally central vertical recess within which said body is disposed, the major part of the vertical extent of said body being contained within said recess. 

1. In a lubricator having a pump with an inlet and an outlet and being operable upon actuation to deliver a substantially predetermined quantity of lubricant through the outlet, a body which defines a passageway having an inlet and an outlet adapted for respective connection with upstream and downstream portions of an airline, a sensing element in said passageway movable to one position in response to starting of a flow of air in said passageway and being retained in said one position under the influence of said air flow for so long as it continues, and being returnable to another position in response to stopping of the air flow, said passageway having a branch through which pump actuating air is valved in response to each movement of said element to said one position, improved structure which comprises, a lubricant reservoir having a top, a bottom, and a hollow interior for containing lubricant, said body being mounted on said top and said pump being mounted on said bottom, said bottom having a lubricant delivery port which communicates with said pump inlet, said branch including a portion which extends through the bottom of said body, and means forming a continuation of said branch having portions which extend through the top, hollow interior, and bottom of said reservoir, said continuation being effective to conduct pump actuating air to said pump.
 2. The structure defined in claim 1 wherein said delivery port is aligned in substantially vertical registry with said pump inlet.
 3. The structure defined in claim 1 wherein said reservoir has means forming a tube which defines said portion of said continuation which extends through said interior thereof.
 4. The structure defined in claim 3 wherein said portions of said continuation extend substantially vertically, said delivery port being aligned in substantially vertical registry with said pump inlet.
 5. The structure defined in claim 1 wherein said portions of said continuation extend substantially vertically.
 6. The structure defined in claim 1 wherein said reservoir has means defining a lubricant delivery duct which communicates with said pump outlet, and passes upwardly through the interior and top of said reservoir.
 7. The structure defined in claim 6 wherein said body has means forming a continuation of said duct.
 8. The structure defined in claim 7 wherein said duct extends through said reservoir bottom, interior, and top and through the bottom of said body.
 9. The structure defined in claim 8 wherein said duct is substantially vertical.
 10. The structure defined in claim 6 wherein said duct extends substantially vertically upwardly from said pump outlet and is formed of a transparent material, a bobber in said duct movable upwardly under impulses of lubricant flow in said duct upon successive actuations of said pump and being gravity returned downwardly between said impulses, said reservoir having a transparent side wall portion through which said bobber is visible.
 11. The structure defined in claim 10 wherein said duct has a shoulder above said reservoir bottom on which said bobber rests in downward position thereof.
 12. The structure defined in claim 11 wherein said shoulder is about halfway between said top and bottom of said reservoir.
 13. The structure defined in claim 12 wherein said bobber comprises a substantially cylindrical body of shiny metal, said side wall portion of Said reservoir being formed as a lens to enlarge the visual image of said bobber.
 14. The structure defined in claim 10 wherein said bobber comprises a substantially cylindrical body of shiny material.
 15. The structure defined in claim 14 wherein said cylindrical body is partially hollowed out from one end to reduce the mass thereof.
 16. The structure defined in claim 10 wherein said side wall portion of said reservoir is formed as a lens to enlarge the visual image of said bobber.
 17. The structure defined in claim 1 wherein said reservoir top has a vertical recess within which said body is disposed, the major part of the vertical extent of said body being received in said recess.
 18. The structure defined in claim 17 wherein said recess is generally centrally located and portions of said reservoir flank opposite sides of said body.
 19. The structure defined in claim 18 wherein portions of said top of said reservoir at opposite sides of said body are provided respectively with a fill opening and a vent opening.
 20. The structure defined in claim 1 wherein said reservoir comprises a base forming said bottom and an inverted cup shaped member having an open lower end defined by edges, lower seal means between said edges and said base, said member having a closed upper end which forms said reservoir top, upper seal means between portions of said top and said body, said upper and lower seal means being provided with generally aligned openings, a tube having upper and lower ends engaged respectively with said upper and lower seal means around said openings, said openings and tube defining said portions of said continuation of said branch.
 21. The structure defined in claim 20 wherein said pump has a housing, top portions of which are secured to said reservoir bottom, third seal means between said top portions and reservoir bottom, said base, third seal means and housing having openings aligned to form a portion of said continuation of said branch.
 22. The structure defined in claim 21 wherein said third seals means has a second opening, said delivery port and pump inlet being aligned on opposite sides of said second opening.
 23. The structure defined in claim 22 wherein said upper, lower, and third seal means and said base have other openings therein generally aligned with said pump outlet, another tube having upper and lower ends engaged respectively with said upper and lower seal means around said other openings therein, said other tube and openings defining a lubricant delivery duct.
 24. The structure defined in claim 23 wherein said body has a passageway therein forming a continuation of said duct.
 25. The structure defined in claim 24 wherein said pump housing, base, reservoir member body, and seal means are secured in assembled relation by common bolt means.
 26. The structure defined in claim 25 wherein a yoke is disposed beneath said pump housing, said bolt means comprising a pair of bolts passing through said yoke, straddling said pump housing, passing upwardly through said reservoir and being threaded into said body.
 27. The structure defined in claim 23 wherein said reservoir member and said tubes are formed of a single integral body of transparent material.
 28. The structure defined in claim 27 wherein said other tube has an interior shoulder about half-way between said reservoir top and bottom upon which a substantially cylindrical bobber of shiny metal rests in non actuated condition of said pump, said bobber being movable upwardly in response to successive actuations of said pump.
 29. The structure defined in claim 28 wherein said reservoir member has a side wall portion shaped as a lens aligned with said duct to enlarge visual images of said bobber.
 30. The structure defined in claim 23 wherein said reservoir top has a generally central vertical recess within which said body is disposed, the major part of the vertical extent of said body being contained within saiD recess. 